# Setting the cup depth

**URL:** <https://forum.onefinitycnc.com/t/setting-the-cup-depth/38553>\
**Category:** Onefinity Easy ATC (Automatic Tool Changer)\
**Created:** [April 28, 2026, 1:29pm UTC](https://forum.onefinitycnc.com/t/setting-the-cup-depth/38553 "2026-04-28T13:29:25Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![tgunr](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/tgunr/32/10947_2.png) [@tgunr](https://forum.onefinitycnc.com/u/tgunr)\
**Post date:** [April 28, 2026, 1:29pm UTC](https://forum.onefinitycnc.com/t/setting-the-cup-depth/38553/1 "2026-04-28T13:29:25Z")

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Here is what I came up with for adjusting the cup depth for different bit stickout.

• Measure the depth of the collet nut, mine are 20mm

• Take the tool or your finger and run down the inner threaded cup

• Place a nut without a bit into the cup

• Measure from top down to edge of the top of the nut, mine was 10.14, just say 10

• Run the inner threaded cup (whatever its called) up so its top is flush to bottom of the recess.

• Place your nut with endmill into cup and measure from top of cup to top edge of the nut

• If it less than what you first measured you endmill is resting on the bottom.

• lets say it is now 2mm, you need to run the cup down 8mm

• Its an 8mm threaded cup so one rotation 360º down is 8 mm

• Measure again until you get the nut resting on the recess instead of the endmill resting.